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Bug is a 1975 American horror film in Panavision, directed by Jeannot Szwarc and written by William Castle and Thomas Page, from Page's novel The Hephaestus Plague (1973). It was the last film Castle was involved in before his death. The film starred Bradford Dillman, Joanna Miles and Richard Gilliand.
- Bradford Dillman as Professor James Parmiter
- Joanna Miles as Carrie Parmiter
- Richard Gilliland as Gerald Metbaum
- Jamie Smith-Jackson as Norma Tacker
- Alan Fudge as Professor Mark Ross
- Patty McCormack as Sylvia Ross
- Jesse Vint as Tom Tacker
- Frederic Downs as Henry Tacker
- Brendan Dillon as Charlie
- James Greene as Reverend Kern